उस वरतिकॎऻ प्लेट की परिधि क्या होगी जिसकी त्रिज्या 28 सेंटीमीटर हो वर्तिका
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Answer:
circumference of circle=πr^2
= 22/7 ×28×28
= 22×4×28
= 88×28
= 2200
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